The voices seem to dependent on something built into the OS. They sound okay on windows and I haven't figured out how to get them to sound good on linux. On windows the voices sound good, but I Wish I could get it to go a little faster. The voices don't sound human so it takes some getting used to.
On linux the voices just sound more harsh. To the point I don't want to use it. If anyone knows a switch to flip or how to install additional voices to make them sound better, that would be great.